Lowbrow is a widespread populist art movement with origins in the underground comix world, punk music, hot-rod street culture, and other subcultures. Lowbrow art often has a sense of humor - sometimes the humor is gleeful, sometimes impish, and sometimes it is a sarcastic comment.
The single most common tactic that Lowbrow artists employ is to poke fun at convention. They know the "rules" of art, and consciously choose not to abide by them.
If the test of time for legitimacy (as an artistic movement) means that Lowbrow speaks/spoke, in visual terms, to the millions of us who share a common cultural, symbolic language - albeit a "lower" or "middle" class, media-driven language - then, yes, Lowbrow is here to stay. Anthropologists will probably study Lowbrow in the future, to attempt to figure out late 20th and early 21st century U.S. societal influences.

I'm a 29 year old artist living with her awesome boyfriend and their two cats! I use art to relax. I believe in making pieces that are weird and off, and causing the viewer to question their previous assumptions and misconceptions.
I enjoy doing a broad variety of work, but I'm partial towards black and white over color.
I write and draw a manga called Eternity Concepts, which you can read for free on:
http://www.hallowedcapriccio.net
http://www.komikia.com/kmk?id=536
http://www.mangamagazine.net/manga-and-comics/Eternity-Concepts/detail-page/1519?lang=en
http://eternityconcepts.smackjeeves.com
http://tapastic.com/series/eternityconcepts
I do another called Satan, the Friendly Goat:
http://www.komikia.com/kmk?id=537
And finally I write for a comic called Your Genitals Are Out To Kill You:
http://ygaotky.smackjeeves.com